This illusion is based on Kokichi Sugihara's academic research (published on Symmetry, the open access journal).
Demo video: https://youtu.be/NTcE6t0xSC4
(embedded below as well)
Computer-generated video: https://youtu.be/9CxvRTE3MxU
(demo prior to printing)
There are many existing solutions to this type of illusion; this version has a more pronounced change in the mirror: very perfect square prisms turning into very perfect cylinders (and vice versa).
If you buy this object and want to share pictures or videos, please make sure to have the camera pointed at 45 degrees, also please make sure the camera is not too close to the object or the illusion will be lost.